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Natural Defence Barriers Most micro-organisms find it difficult to get inside the body. Without constant defence of our body's barriers we would constantly be ill or even die, as a huge influx of micro-organisms would occur. The body has four main ways of preventing potential illnesses from entering the body. Chemical Defences - Sweat, tears, saliva and mucus all contain anti-micro-organism chemicals that inhibit their entrance and growth. These secretions all contain vital enzymes that deter the pathogens. These are: * Lysoozyme - In a bacteria attack this can be found in the bacterium cell walls. Here it catalyses the hydrolysis of the molecule. * Lactate is contained in sweat and this slows the growth of bacterium. * The gastric juices of the stomach are in part component of hydraulic acid which is used to dissolve and brake down food in a normal situation. In the presence of bacterium it will do the same. Mechanical Defences...

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